Can not save the changed values on the Advance Grid feature

I cannot change the value of INFOTABLE during the Advance Grid feature of Thingworx 9.2.0.

The operation as follows;

1 create  a DataShape for INFOTABLE.

2 create a ThingShape includes INFOTABLE  properties defined by the created DataShape.

3 Create Thing and set default values in INFOTABLE properties.

4 Create a Mashup with Advance Grid Widget as follows.

  (1) Bind INFOTABLE to Data of Advance Grid Wiget by getProperties service.

 (2) set all columns to be editable on the setting grid column of Advance Grid Widget context menu.

 (3) check EnableEditButtons in Property tab of Advance Grid Widget,

5 show created widjet.

6 click the edit button.

7 change values of cells.

8 click the save button.

9 Chaned values are displyed on the grid, at this point, looks so good!

10  click edit button again.

11  cells are not changed.(same as default values)

Please show me something wrong.

Regards,